(1) one by one 一个个地 Students went out of the classroom one by one as soon as the bell rang. 下课铃一响，学生们一个个从教室里走出来。
(2) at one 一致 Their opinion is at one. 他们的意见一致。 另外，还表示在一点钟Listen, I finish at one.
听我说，我一点钟收工。
(3) in one 合为一体 It's a book of English phonetics，grammar and usage in one. 这是一本英语语音、语法和习惯用语结合为一体的书。
(4) one another 互相 We should help one another． 我们应该互相帮助。
(5) one to one 一比一 Neither of them won，one to one. 他俩没一个赢，而是一比一。
(6) one too many 多余的，不需要的 I found myself one too many among people. 我发现自己在人群中是个多余的人。
(7) one in a thousand 优秀的人（或事物） My brother is a one in a thousand． 我的兄弟是位优秀人物。
(8) taking one with another 总的看来 The youth，taking one with another，is a nice worker． 总的来说，这位年青人还是个不错的工人。
(9) from the first 首先；马上；立刻 I knew him from the first． 从一开始我就认识他。
(10) first off 首先；马上；立刻 They come to our office first off． 他们马上就要到我们办公室来。
(11) first water 极端 ；一流的，头号的
You are a fool of the first water. 你真是个大傻瓜。
All the products made by the factory are of the first water.
这家工厂生产的产品都是一流的。
Diana is nothing but a fool of the first water.
黛安娜只不过是个大傻瓜而已。
He's a snob of the first water.
他是个头号势利小人。